JPH0368523B2 - - Google Patents

Description

[Detailed description of the invention]

[Field of Application of the Invention] The present invention relates to a method for manufacturing a wedge-shaped coil, and in particular, after pressing and bending both ends of a flat coil in which conductors are wound in an aligned manner, the conductors are bonded together under pressure. The present invention relates to a method of manufacturing a saddle-shaped coil in which conductors are bonded and solidified. [Background of the Invention] First, a method for manufacturing a wedge-shaped coil (Japanese Patent Application No. 58-093926 and Japanese Patent Application No. 58-107803), which was previously developed by the present inventors, will be explained using drawings. FIG. 1 is a perspective view showing an example of a hollow-shaped coil in which conductors are bonded and solidified, which is the subject of the present invention.
This explains the manufacturing method of the hollow-shaped coil.
FIG. 2 is a side view showing an example of a manufacturing jig used for carrying out the manufacturing method and a flat coil formed by the manufacturing jig, and FIG. 3 is a side view showing the manufacturing jig according to FIG. 2. 4 is a plan view of the jig; FIG. 4 is a front view showing the lower jig in FIG. 2 attached to a winding machine for winding; and FIG. 5 is a view taken in the direction of the arrow in FIG. 4. 6 is a front view showing the manufacturing jig shown in FIG. 2 set on a pressure table of a press, and FIG. 7 is a view taken along the arrow in FIG. 6. In FIG. 1, numeral 1 denotes a saddle-shaped coil in which conductors are bonded and solidified. In Figures 2 and 3, 2 is the lower plate, 3 is
A lower mold is fixed to this lower plate 2 and is formed into a convex shape 3a that is the same shape as the lower surface shape of the hollow coil so that the conductor does not stretch in each part even after forming the hollow coil 17. For type 3,
A winding core insertion groove (not shown) is bored. 4
is a winding core consisting of two winding core pieces 5 and 6, and this winding core 4 is inserted into the winding core insertion groove with its lower end part inserted into the lower plate so that the length of the coil forming part L _c can be adjusted. It is now possible to move on 2. 7 is fixed to the lower plate 2, and by driving a motor (not shown) to rotate its threaded portion 7a,
This is a core driving device that can move the core pieces 5 and 6 that are fitted into the threaded portion 7a at the female threaded portions 5a and 6a toward or away from each other, and includes the lower plate 2, the lower mold 3, and the core 4. , core drive device 7
This constitutes the lower jig 8. 9 is an upper plate, and 10 is fixed to the upper plate 9, and is formed into a concave shape 10a having the same shape as the upper surface shape of the hollow coil so that the conductor does not stretch in each part even after forming the hollow coil from the flat coil 17. This upper mold 10 is provided with a winding core insertion groove 11 that penetrates to the upper plate 9.
The upper plate 9 and the upper mold 10 constitute an upper jig 12. On the other hand, in FIGS. 4 and 5, reference numeral 13 denotes a rotary plate rotatably attached to the winding machine main body 14, and the lower jig 8 can be mounted on this rotary plate 13. Reference numeral 15 denotes a drive device that can drive the rotating plate 13 while winding the conductor 16 around the winding core 4 . In addition, in FIGS. 6 and 7, 18 is a pressurizing table of the press, 19 is a pressurizing ram of the press, and 2
0 and 21 are side push blocks in which a heater is embedded, 22 and 23 are end push blocks in which a heater is embedded, and 24 and 25 are
Hydraulic cylinders 26, 27 fixed on the pressure table 18 and pressurizing the side push blocks 20, 21;
is a hydraulic cylinder fixed on the pressure table 18 and pressurizing the end push blocks 22, 23. A method for manufacturing a saddle-shaped coil 1 (FIG. 1) in which the conductors are bonded and solidified using the saddle-shaped coil manufacturing jig constructed as described above will be described. First, the core drive device 7 of the lower jig 8 is driven to position the core pieces 5 and 6 so that the coil forming portion length _lc becomes a predetermined length. Once the positioning is completed, the lower jig 8 is attached to the rotary plate 13 of the winding machine, as shown in FIG. The drive device 15 is driven to rotate the rotating plate 13 and the conductor 16 is wound around the winding core 4. The conductor 16 has an insulating coating wrapped with a thermosetting resin adhesive tape (not shown). After arranging and winding a predetermined number of turns to form the flat coil 17 (see Figure 2), the rotary plate 13 is stopped, the lower jig 8 is removed from the rotary plate 13, and this is shown in Figure 2. Place it horizontally as shown. Next, the core insertion groove 11 of the upper jig 12 is fitted into the core 4 of the lower jig 8, and the upper jig 12 is placed on the flat coil 17. At this time, the upper jig 12
is the coil winding axis direction 28 using the winding core 4 as a guide.
It is now possible to slide. The manufacturing jig thus assembled is set on the pressure table 18 of the press. A control device (not shown) includes a pressurizing ram 1 of the press.
Maximum descending amount of 9 (corresponding to pushing amount δ)
and the maximum displacement h of the winding core pieces 5 and 6 (the midway displacement is
(proportional to the amount of descent of the pressurizing ram 19). The maximum displacement h of the winding core pieces 5 and 6 is set so that when both sides of the flat coil 17 are pushed in by δ, no elongation occurs in the circumferential length of one turn on the upper surface of the inner circumference of the coil. , 6. When the pressurizing ram 19 of the press is brought into contact with the upper plate 9 and the control device is turned on, the press and winding core drive device 7 are started, and the pressurizing ram 19 starts descending, and at the same time corresponds to the amount of this descending. While the winding core pieces 5 and 6 are displaced and approaching each other, both ends of the flat coil 17 are pressed by the upper die 10 and the lower die 3,
When each part of the conductor is bent without elongation, the upper die 10 is pushed by δ by the pressure ram 19, and the winding core pieces 5 and 6 are each displaced by h, a hollow-shaped coil is formed. The control device
It is turned OFF, and the pressurizing ram 19 and the winding core drive device 7 stop. Next, on top of the hollow-shaped coil formed in this way,
With the lower surface pressurized, the hydraulic cylinders 24, 2
5, 26, and 27 to push the side push block 2
0, 21, end push blocks 22, 23,
Pressurizing the sides and ends of the hollow coil,
Push in by δ ₁ . At the same time, the heaters embedded in the side push blocks 20, 21 and the end push blocks 22, 23 are energized to heat the hollow coil, so that the temperature of the hollow coil becomes higher than that of the adhesive tape. When the curing temperature is reached, this adhesive tape flows and hardens after a predetermined time to bond the conductors 16, thereby obtaining the desired saddle-shaped coil 1 in which the conductors are bonded and solidified. However, the above-described method for manufacturing a hollow-shaped coil has the following problems that should be improved. This will be explained using FIG. FIG. 8 is a schematic diagram showing a state in which one turn of the outer periphery of the coil is pushed in by δ ₁ by pressurizing the side and end portions after the saddle is formed. In FIG. 8, the broken line shows the image object before pressurization, and the solid line shows the image object after pressurization. This pushing amount δ ₁ can be calculated as follows. In other words, if the pressing force is large enough,
The thermosetting resin adhesive tape placed between the conductors 16 flows out into the gaps at the corners of the conductors 16, the gaps between the push blocks 20, 21, 22, 23, etc., and the coil thickness is almost the same as the thermosetting resin. adhesive tape thickness by an amount equal to the total adhesive tape thickness. From this, the indentation amount δ ₁ is equal to the total thickness of the thermosetting resin adhesive tape. When the coil is pushed in by δ ₁ in this way, the length of one turn on the outer circumference of the coil is shortened by approximately 2π(r ₂ −r)=2πδ ₁ . If this amount is large, the conductor 16 will buckle,
This results in a wavy state and a gap is generated between the conductors 16. When a gap occurs, for example, in the case of a superconducting coil, the restraining force of the conductor becomes weaker, causing the conductor to move when electromagnetic force is applied, and this movement may generate frictional heat that may cause quenching. Furthermore, there was also a risk that cracks would occur after the coil was formed due to residual stress due to the buckling. [Object of the Invention] The present invention improves the above-mentioned method for manufacturing a hollow-shaped coil, which was previously developed by the present inventors, to produce a conductor that does not create gaps between conductors or cracks. The object of the present invention is to provide a method for manufacturing a saddle-shaped coil in which the coil is bonded and solidified. [Summary of the Invention] The structure of the method for manufacturing a hollow-shaped coil according to the present invention is such that the core is made up of two core pieces that allow the length of the coil-formed part of the core to be adjusted, and a heat-curing layer is applied onto the insulation coating. A flat coil is formed by winding conductors coated with a plastic adhesive in an aligned manner, and after forming the hollow, the conductor on the inner circumference of the coil does not elongate, while the conductor on the outer circumference of the coil has a specified elongation. The coil of the core is set between an upper mold and a lower mold formed to have the same upper and lower surface shapes as the upper and lower surfaces of the coil. While shortening the length of the molded part, the upper die is pushed toward the lower die to press and bend both ends of the flat coil by a predetermined amount in the direction of the coil winding axis, and then the coil is bent in the direction of the coil winding axis and in a direction perpendicular thereto. The coil is pressed and heated to a temperature higher than the curing temperature of the adhesive to make the adhesive fluid and then solidified, thereby producing a saddle-shaped coil in which the conductors are bonded and solidified. [Examples of the Invention] The present invention will be explained below with reference to Examples. FIG. 9 is a side view showing an example of a manufacturing jig used for carrying out a method for manufacturing a saddle-shaped coil according to an embodiment of the present invention, together with a flat coil formed into a saddle shape using the manufacturing jig; , FIG. 10 is a side view showing an enlarged end of the hollow-shaped coil, and FIG.
FIG. 2 is a plan view of the end portion according to FIG. In FIG. 9, parts given the same numbers as in FIG. 2 are the same parts. 3A is a lower jig 8A and a lower mold, and this lower mold 3A is fixed to the lower plate 2, and after forming the hollow from the flat coil 17,
A convex shape 3b having the same shape as the lower surface shape of the saddle-shaped coil, which is formed into a shape that causes no elongation in the conductor on the inner circumference of the coil, but causes an elongation of 2πδ ₁ related to a predetermined elongation on the conductor on the outer circumference of the coil. (This shape will be described later in a specific example). 10A is the upper mold of the upper jig 12A. This upper mold 10A is fixed to the upper plate 9, and after forming the hollow from the flat coil 17, the conductor on the inner circumference of the coil is not stretched, and the outer circumference of the coil is The conductor has a concave shape 10b (this shape will also be described later in a specific example) that is the same shape as the lower surface of the saddle-shaped coil, which is formed into a shape that causes an elongation of 2πδ ₁ related to a predetermined elongation. It is. As mentioned above, if the sides and ends are pressurized after the shoulder is formed, one turn on the outer circumference of the coil will be approximately
Shorten by 2πδ ₁ (where δ ₁ is the total thickness of the adhesive tape wrapped around the conductor). Therefore, if we create a saddle-shaped coil shape so that the circumferential length of one turn on the outer circumference of the coil becomes longer by 2πδ ₁ and the elongation of the circumferential length of one turn on the inner circumference of the coil becomes 0 after the hollow forming, ( If the elasticity is within the elastic range), when the hollow coil is pressurized and heated to solidify the bond between the conductors, the circumference of each conductor becomes equal to the length before forming the hollow, creating a gap between the conductors. Never. A method for manufacturing a saddle-shaped coil using the manufacturing jig for a saddle-shaped coil configured as described above is as follows.
In place of the manufacturing jig for the saddle-shaped coil according to the figure,
This method is the same as the method for manufacturing a saddle-shaped coil previously developed by the inventors of the present invention, except that the manufacturing jig for the saddle-shaped coil shown in the figure is used. That is, to briefly describe the method, first, the core drive device 7 of the lower jig 8A is driven to position the core pieces 5 and 6 so that the coil forming portion has a predetermined length. Then, the lower jig 8A is attached to the rotating plate 13 shown in FIG. 4, and the conductor 16 is wound around the winding core 4 to form a flat coil 17. The lower jig 8A is removed from the rotating plate 13, and the upper jig 12A is placed on the flat coil 17 as shown in FIG.
Put on. The manufacturing jig thus assembled is set on the pressure table 18 of the press (see FIG. 6). A control device (not shown) includes a pressurizing ram 1 of the press.
Maximum descending amount of 9 (corresponding to pushing amount δ)
and the maximum displacement h of the winding core pieces 5 and 6 (the midway displacement is
(proportional to the amount of descent of the pressurizing ram 19). The maximum displacement h of the winding core pieces 5 and 6 is set so that when both ends of the flat coil 17 are pushed in by δ, no elongation occurs in the circumferential length of one turn on the upper surface of the inner circumference of the coil. , 6. When the pressurizing ram 19 of the press is brought into contact with the upper plate 9 and the control device is turned on, the press and winding core drive device 7 are started, and the pressurizing ram 19 starts descending, and at the same time corresponds to the amount of this descending. As the winding core pieces 5 and 6 are displaced and approach each other, both ends of the flat coil 17 are pressed by the upper die 10A and the lower die 3A, and the outer circumference of the coil is stretched without causing any elongation in the conductor on the inner circumference of the coil. The conductor is bent so as to cause an elongation of 2πδ ₁ , and the pressure ram 1
When the upper mold 10A is pushed in by δ by 9 and the winding core pieces 5 and 6 are each displaced by h, a hollow-shaped coil is formed and the control device is turned OFF,
Pressure ram 19 and core drive device 7 stop. Next, on top of the hollow-shaped coil formed in this way,
With the lower surface pressurized, the hydraulic cylinders 24, 2
5, 26, and 27 to push the side push block 2
0, 21, end push blocks 22, 23,
Pressurizing the sides and ends of the hollow coil,
Push in by δ ₁ . At the same time, the heaters embedded in the side push blocks 20, 21 and the end push blocks 22, 23 are energized to heat the wedge-shaped coil, so that the temperature of the coil becomes higher than that of the adhesive tape. When the curing temperature is reached, the adhesive tape flows and hardens after a predetermined time to bond the conductors 16, thereby obtaining the desired saddle-shaped coil 1 in which the conductors are bonded and solidified without any gaps between the conductors. A specific example will be explained below. Each coordinate x ₁ , x ₂ , x ₃ is set to the 10th and 11th coordinates, respectively.
Take as shown. And C ₁ , C ₂ , C ₃ , C ₄ are
Each curve is a curve representing the outer shape of the end of the hollow coil. A case will be explained in which the coil height H is relatively small (for example, H<(l ₁ +r ₂ )/10). In this case, it may be assumed that the curves C ₁ and C ₂ are the same, and the curves C ₃ and C ₄ are the same. Also, the range,
, the curves C ₂ and C ₄ are respectively the curve C ₁
and C ₃ are translated by H in the x ₃ direction. Here, the inner radius of the winding core r ₁ = 45 mm, the outer radius of the winding core
r ₂ = 83 mm, pressure ram push-in amount δ = 40 mm, amount of elongation of outer circumference due to shoulder formation (elastic deformation amount) 2πδ ₁ =
Assuming that 2π×0.7=4.4mm and the amount of extension of the inner circumference due to the saddle shape = 0, the curves C ₁ , C ₂ , C ₃ , and C ₄ representing the outer shape of the end of the saddle shape coil are as follows. It will look like a table.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to provide a method for manufacturing a saddle-shaped coil in which the conductors are bonded and solidified without creating gaps or cracks between the conductors.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of a hollow-shaped coil in which conductors are bonded and solidified, which is the subject of the present invention.
This explains the manufacturing method of the hollow-shaped coil.
FIG. 2 is a side view showing an example of a manufacturing jig used for carrying out the manufacturing method and a flat coil formed by the manufacturing jig, and FIG. 3 is a side view showing the manufacturing jig according to FIG. 2. 4 is a plan view of the jig; FIG. 4 is a front view showing the lower jig in FIG. 2 attached to a winding machine for winding; and FIG. 5 is a view taken in the direction of the arrow in FIG. 4. 6 is a front view showing the manufacturing jig shown in FIG. 2 set on the pressure table of the press, FIG. 7 is a view taken in the direction of the arrow in FIG. 6, and FIG. FIG. 9 is a schematic diagram showing a state in which one turn of the outer circumference of the coil is pushed in by δ ₁ by pressurizing the sides and ends after forming. A side view showing an example of a manufacturing jig that is used to carry out the method and a flat coil formed into a hollow shape using the same; FIG. 10 is a side view showing an enlarged end of the hollow coil; , FIG. 11 is a plan view of the end portion according to FIG. 10. 1...A hollow-shaped coil with conductors bonded and solidified, 3
A...lower mold, 3b...convex shape, 4...winding core,
5,6... Core piece, 10A... Upper mold, 10b...
concave shape, 16... conductor, 17... flat coil,
28... Coil winding axis direction, C ₁ , C ₂ , C ₃ , C ₄ ...
External curve of the end of the coil, δ...Pushing amount (of the pressurizing ram), δ ₁ ...Pushing amount (of the hydraulic cylinder).

Claims (1)

[Claims] 1. A conductor with a thermosetting resin adhesive disposed on the insulation coating is wound and formed in an aligned manner around the core, which is made up of two core pieces whose length can be adjusted. The flat coil is formed into a shape that does not cause any elongation in the conductor on the inner circumference of the coil and causes a specified elongation in the conductor on the outer circumference of the coil after forming the coil.The shape is the same as that of the top and bottom surfaces of a saddle-shaped coil. The coil is placed between an upper mold and a lower mold that have been formed into a shape, and the upper mold is pushed toward the lower mold while shortening the length of the coil forming part of the winding core so as not to cause elongation on the inner periphery of the coil. After pressing and bending both ends of the flat coil by a predetermined amount in the direction of the coil winding axis, pressure is applied in the direction of the coil winding axis and in a direction perpendicular thereto, and the adhesive is heated to a temperature higher than the curing temperature of the adhesive. 1. A method for manufacturing a saddle-shaped coil, characterized by manufacturing a saddle-shaped coil in which conductors are bonded and solidified by bringing the coil into a fluid state and then solidifying the coil.